A few days back, designs for the PCB for a new Nvidia card were revealed based on the GF106 architecture which wi be aimed at the mainstream market.

Recently it has been revealed that the new GPU will be the GTS450 which will be priced at $160 with 1GB DDR5 memory and a 128bit interface. The core will be clocked at 789 Mhz where as the memory will be clocked at 940Mhz (actual).

Source